直接寫出得數(shù)
3
4
×
2
3
=
1
8
×
2
5
=
5
6
×18=
4
5
÷8=
4
7
=
3
4
×
7
2
×
4
5
=
5
6
÷
1
2
=
3
10
÷
14
15
=
8
9
÷
4
7
÷
1
3
=
0.25+
3
4
=
1
2
-
1
4
=
5
14
÷
4
21
×
16
25
=
2
7
÷
8
21
=
3
14
×
7
8
=
8-4÷
4
7
=
5
6
-
1
2
=
7
18
÷14=
12×(
2
3
-
1
6
)=
5%×5=
1
5
+
2
7
+
4
5
+
3
7
=
3.75+
5
8
=
63%-27%= (1-20%)÷20%= 0.4÷
2
5
=
4
9
×1.8=
4
9
×25%=
分析:題目較多,都是有關(guān)小數(shù)、百分?jǐn)?shù)、分?jǐn)?shù)的四則混合運(yùn)算,根據(jù)題目特點(diǎn),運(yùn)用運(yùn)算定律、數(shù)字轉(zhuǎn)化等方法,解答此題.
解答:解:
3
4
×
2
3
=
1
2
,
1
8
×
2
5
=
1
20
5
6
×18=15,
4
5
÷8=
1
10
,
4
7
=
21
2
,
3
4
×
7
2
×
4
5
=
21
10
5
6
÷
1
2
=
5
3
,
3
10
÷
14
15
=
9
28
8
9
÷
4
7
÷
1
3
=
14
3
,
0.25+
3
4
=1,
1
2
-
1
4
=
1
4
,
5
14
÷
4
21
×
16
25
=
6
5
,
2
7
÷
8
21
=
3
4
,
3
14
×
7
8
=
3
16
,
8-4÷
4
7
=1,
5
6
-
1
2
=
1
3
,
7
18
÷14=
1
36
12×(
2
3
-
1
6
)=6,
5%×5=0.25,
1
5
+
2
7
+
4
5
+
3
7
=1
5
7
,
3.75+
5
8
=4.375,
63%-27%=0.36, (1-20%)÷20%=4, 0.4÷
2
5
=1,
4
9
×1.8=0.8,
4
9
×25%=
1
9
點(diǎn)評(píng):此題考查了多方面的知識(shí):約分、乘除法的轉(zhuǎn)化、數(shù)字轉(zhuǎn)換、運(yùn)算定律的運(yùn)用等.
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